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 Post subject: Master Tube Substution handbook
PostPosted: Aug Sat 10, 2019 2:01 pm 
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Joined: Aug Thu 08, 2019 2:45 pm
Posts: 6
If u need to know about a tube Substution. i might be able to help out.


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 Post subject: Re: Master Tube Substution handbook
PostPosted: Aug Sun 18, 2019 3:53 am 
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Location: Central PA 16801
thanks, but a lot of us have tons of books galore that can help us do the same. can you elaborate upon your service ?

:? :? :?: :?:

steve

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Last edited by Dutch Rabbit on Aug Sun 18, 2019 3:57 am, edited 2 times in total.

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 Post subject: Re: Master Tube Substution handbook
PostPosted: Aug Sun 18, 2019 3:55 am 
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Joined: Jun Sat 15, 2019 7:43 pm
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How about a direct sub for a 1L6


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 Post subject: Re: Master Tube Substution handbook
PostPosted: Aug Sun 18, 2019 3:57 am 
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I need some cheap direct subs for the 8417 and the 7027a.

:?

steve

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 Post subject: Re: Master Tube Substution handbook
PostPosted: Aug Sun 18, 2019 2:37 pm 
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how about a direct sub for a 7868 ?

steve

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 Post subject: Re: Master Tube Substution handbook
PostPosted: Aug Sun 18, 2019 2:53 pm 
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Location: Roanoke, VA
devilsmist wrote:
How about a direct sub for a 1L6

The only direct sub for a 1L6 is a 1L6. Other tubes may be partially functional in, say, a TO, but there is no true substitute for a 1L6. Using a substitute for a 1L6 in a TO generally adversely affects the higher frequencies.

Tube substitution guides were largely an outgrowth of WWII, when most tube production was going to the military and there was a shortage of some tube types for domestic replacement purposes. Some stayed in print through the early '60s. With a fairly small number of exceptions you cannot expect equipment with a tube from a substitution guide to perform as well as it would with the correct tube. I have the Middleton tube substitution guidebooks but they are shelf queens - part of my collection of electronic works in print. I do not use them because I see no need to substitute tubes. All of the tubes that I need are still available, although some have gotten expensive.

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 Post subject: Re: Master Tube Substution handbook
PostPosted: Aug Mon 19, 2019 3:49 am 
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i tend to believe someone might be playing games in this thread.

i've only substituted one tube in my entire life due to a poorly designed circuit that used a 6SD7 where the change of a resistor and the use of the 6SG7 sealed the deal.

it was classic textbook circuitry in a late 30s AM/SW table set as motorola must have received a great deal on the horrible 6SD7, which was a total failure for the oscillator in the SW section.

as for someone providing a "service" for tube substitution, or a "master book", that gives me a chuckle.

all i need are my excellent RCA/GE Essential Characteristics books and my own four or five tube substitution books from RCA, Sylvania, GE, and a few others.

...that is, if i ever do substitute a tube (out of thousands of opportunities) for the second time in my life.

i'm out on this thread, guys.

steve

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 Post subject: Re: Master Tube Substution handbook
PostPosted: Aug Mon 19, 2019 7:45 am 
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I think the OP was just trying to be helpful, not knowing the knowledge and experience some members here have.


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 Post subject: Re: Master Tube Substution handbook
PostPosted: Aug Mon 19, 2019 7:50 am 
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^ I agree. It's nice to see someone offer help, vs the usual "what's it worth?" one post wonders.

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 Post subject: Re: Master Tube Substution handbook
PostPosted: Aug Mon 19, 2019 10:20 am 
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Attachment:
Chump.jpg
Chump.jpg [ 113.24 KiB | Viewed 570 times ]


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 Post subject: Re: Master Tube Substution handbook
PostPosted: Aug Mon 19, 2019 2:09 pm 
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"Oh Stewardess, I speak Jive"...

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 Post subject: Re: Master Tube Substution handbook
PostPosted: Aug Mon 19, 2019 2:31 pm 
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oops--my mistake

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"Measure voltage, but THINK current." --anon.


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 Post subject: Re: Master Tube Substution handbook
PostPosted: Aug Fri 23, 2019 4:46 pm 
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devilsmist wrote:
How about a direct sub for a 1L6



1U6

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 Post subject: Re: Master Tube Substution handbook
PostPosted: Aug Fri 23, 2019 5:03 pm 
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That's what is often listed a sub for 1L6 but filament current is half. Won't work in a radio with series wired filaments unless a resistor is added. Most 1L6's are in series string radios.

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 Post subject: Re: Master Tube Substution handbook
PostPosted: Aug Fri 23, 2019 5:52 pm 
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I just don't substitute tubes. No reason to as pretty much any one I need is readily available, though sometimes a bit costly. Transistors are a different story. I will sub them as needed.


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 Post subject: Re: Master Tube Substution handbook
PostPosted: Aug Fri 23, 2019 5:57 pm 
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Can I use a 304CRES tube for a 316CRES tube? :?: 8)

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 Post subject: Re: Master Tube Substution handbook
PostPosted: Aug Fri 23, 2019 8:05 pm 
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I prefer 304L tube when I have to weld it. :roll:


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 Post subject: Re: Master Tube Substution handbook
PostPosted: Aug Sun 25, 2019 6:37 am 
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Joined: Sep Thu 23, 2010 6:37 am
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Location: Powell River BC Canada
Kids rummaging around in the garbage cans of telephone exchanges,
and tv/radio radio shops learned that you used what you got your hands on.

Small wonder the old geezers today wont throw out old tubes. :D

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Amateur Radio Literacy Club. May we help you read better.
Steve Dow
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 Post subject: Re: Master Tube Substution handbook
PostPosted: Aug Sun 25, 2019 4:54 pm 
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Joined: Nov Mon 05, 2007 11:08 pm
Posts: 2874
Location: Calgary Alberta
Try find a sub for a Rogers 6F7M, with out doing some wiring changes.
So far , I am told that there is no sub for this tube.
They are like hens teeth
Rogers had some tubes that were their own, and had no sub.
Dan in Calgary


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 Post subject: Re: Master Tube Substution handbook
PostPosted: Aug Sun 25, 2019 7:24 pm 
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Joined: Sep Thu 23, 2010 6:37 am
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Location: Powell River BC Canada
The 6F7 is/was a common tube. Dip one in silverink metalized coating. Then make a ground
contact loop around the top of the base.
Attachment:
EBAY 6F7.JPG
EBAY 6F7.JPG [ 55.14 KiB | Viewed 258 times ]

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